Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The synthesis and utility of β-oxotryptamine and β-oxytryptophan ester synthons provide a convenient entry to 5-(3-indolyl)oxazole natural products leading to a structure revision of almazole D. ... Almazole D (1) is a secondary metabolite isolated from red alga that possesses potent antibacterial ...